Can I help you ?   I'd like two kilos of eggs .   What kind ?   Do you have the eggs with the red yolk ?   Sorry , madam . We have stopped selling those kinds of eggs for a week .   Why ?   You know , red yolk is proved unnatural . It's artificial , and may lead to cancer .   Oh , My God ! That's terrible .   Yes , so they are no longer being sold .   Then give me the ordinary ones . 